Topic Title: Dual-channel disabled
Topic Summary: 8Gb detected in bios/cpu-z in single-channel, 4Gb detected in Windows 64 bits in single-channel.
Created On: 11/13/2013 10:59 AM
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 11/13/2013 10:59 AM
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Joined: 11/13/2013

Hi there,

I just built a new pc from scratch and these are the specifications of my pc:


Gigabyte F2A85XM-D3H motherboard socket FM2 bios version f4c (latest one)

APU A10-6800K AMD processor

2*4Gb G.Skill  F3-14900CL8D-8GBXM wich is compatible with the motherboard

120Gb ssd samsung


Windows 7 64 bits

PSU 500W


I can run the system without any problems but for one thing. It depends on the way i plug my ram, but in any cases, the bios and cpu-z detect my 8Gb or ram plugged on the motherboard. Considering that, Windows only detects the ram plugged in the socekts of the first channel. Which means that if my ram sockets are displayed by relation to the processor socekt








the only way for Windows to detect that there is 8Gb installed on my motherboard is by plugging them in socket 4 and 2 that are not in dual channel. Plugging the ram in socket 1 and 3 will not even work.

If i plug bot sticks in socket 1 and 2 together, or in socket 3 and 4 together, Windows will only detect 4Gb. That is, even if the bios mention 8Gb of ram as well as cpu-z. Cpu-z will mention that the ram will always be in single-channel in any configuration.

I already asked an rma for the motherboard and the same problem happened to me with the new motherboard. I switched the ram from sockets and nothing was different. I also verified in Windows in the system monitor concerning the ram and in msconfig as well.

I did some researches and what i found was that it might be a cpu/apu problem. The apu looks pretty much ok visually though. I don't know if it's possible, but the chip would be defective for the dual-channel, but working pretty well for the rest. I'm not an expert, but my researched lead me to that. Is it plausible? Or is it a problem concerning the voltage?

Thank you for answering what you think of that. I may be way off the real problem, but as I mentionned, I'm not an expert.

Edited: 11/13/2013 at 11:32 AM by npgoodhue
 11/13/2013 01:56 PM
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Ninja Zombie Killer

Posts: 4905
Joined: 12/27/2008

You need to contact the manufacturer of the motherboard about it, as it is a motherboard issue.


CPU: AMD Phenom II X4 810 @ 3120MHz | RAM: Kingmax 2x2GB DDR2 800 @ 833MHz| MoBo: MSI K9A2 CF v1.0 (BIOS: 1.D)| GPU: Asus HD 6850 1024MB (DirectCu) @ 835/1135MHz | Display: L24FHD | PSU: PC Power & Cooling Silencer 750 Quad | OS: MS Windows 3.11 Pro x64

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